Origin of different contributions to the magnetic susceptibility of the normal-state YBa2Cu3O y HTSC

The magnetic susceptibility of the normal-state YBa2Cu3Oy high-temperature superconductor has been experimentally investigated as a function of the degree of structural disorder by the example of a series of fine-grained samples. Different coexisting contributions have been revealed and their origin was investigated. A correlation between the changes in the structural parameters and the magnitudes of these contributions to the magnetic susceptibility is established.